littleBits is an open-source library of electronics and platform for play. Its community of users upload videos and pictures of their projects. Re-usability is built into the experience: Bits can be used again and again and with simple craft materials. The installations, measuring up to 48 inches tall to the one-inch square littleBits, runs through May 12. Here, a detail of the Soho installation. Photo courtesy littleBits.